Go to your nearest used book store.
There is a book called 'Photography'. By Barbara something and John Upton. It has SEVERAL editions. I think the 9th edition is out...
THe first ones were when Barbara and John were married, it was "photography - by barbara and John Upton" but her name changed in the later editions and there are a few new authors...
When I teach photo classes, that is the recommended text. Also, IF you were into professional photography, and were a member of PPA.com, you would have to memorize that book to become a Certified Professional Photographer. It is an industry standard, and is BASIC, so don't be afraid.
The later editions have a lot of digital crap in it. Learn the basics of photography FIRST, then the digital comes..